List of top Chemistry Questions

In the structure of the dichromate ion, there is a :

Two flasks I and II shown below are connected by a valve of negligible volume. When the valve is opened, the final pressure of the system in bar is \(x \times 10^{-2}\). The value of x is _________. (Integer answer) 
[Assume - Ideal gas; 1 bar = 10\(^5\) Pa; Molar mass of N\(_2\) = 28.0 g mol\(^{-1}\); R=8.31 J mol\(^{-1}\) K\(^{-1}\)] 

 

Which one of the following chemicals is responsible for the production of HCl in the stomach leading to irritation and pain ? 

The correct structures of A and B formed in the following reactions are : 

 

The major product of the following reaction, if it occurs by S\(_N\)2 mechanism is : 

 

Choose the most appropriate answer from the options given below : 

The addition of dilute NaOH to Cr\(^{3+}\) salt solution will give :
The number of photons emitted by a monochromatic (single frequency) infrared range finder of power 1 mW and wavelength of 1000 nm, in 0.1 second is \(x \times 10^{13}\). The value of x is _________. (Nearest integer)
(h = 6.63 \(\times\) 10\(^{-34}\) Js, c=3.00 \(\times\) 10\(^8\) ms\(^{-1}\))
100 g of propane is completely reacted with 1000 g of oxygen. The mole fraction of carbon dioxide in the resulting mixture is \(x \times 10^{-2}\). The value of x is _________. (Nearest integer)
[Atomic weight : H=1.008; C=12.00; O=16.00]
When 5.1 g of solid NH\(_4\)HS is introduced into a two litre evacuated flask at 27\(^\circ\)C, 20% of the solid decomposes into gaseous ammonia and hydrogen sulphide. The K\(_p\) for the reaction at 27\(^\circ\)C is \(x \times 10^{-2}\). The value of x is _________. (Integer answer)
[Given R = 0.082 L atm K\(^{-1}\) mol\(^{-1}\)]
Hydrolysis of sucrose gives :
Given below are two statements:
Statement I : Ethyl pent-4-yn-oate on reaction with CH\(_3\)MgBr gives a 3\(^\circ\)-alcohol.
Statement II : In this reaction one mole of ethyl pent-4-yn-oate utilizes two moles of CH\(_3\)MgBr.
In the light of the above statements, choose the most appropriate answer from the options given below :
The major product (A) formed in the reaction given below is :
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Potassium permanganate on heating at 513 K gives a product which is :
In stratosphere most of the ozone formation is assisted by :
Which one of the following is used to remove most of plutonium from spent nuclear fuel ?
Which one of the following tests used for the identification of functional groups in organic compounds does not use copper reagent ?
Which one of the following is formed (mainly) when red phosphorus is heated in a sealed tube at 803 K ?
Choose the correct statement from the following:
The oxide that gives H\(_2\)O\(_2\) most readily on treatment with H\(_2\)O is :
The correct order of ionic radii for the ions, P\(^{3-}\), S\(^{2-}\), Ca\(^{2+}\), K\(^{+}\), Cl\(^{-}\) is:
Lyophilic sols are more stable than lyophobic sols because,

Out of following isomeric forms of uracil, which one is present in RNA? 

The correct statement about (A), (B), (C) and (D) is: 

The major product of the following reaction is: